CN109651856B - A new type of inorganic intumescent steel structure fireproof coating and preparation method thereof - Google Patents

Abstract

The invention discloses a novel inorganic expansion steel structure fireproof coating and a preparation method thereof, belonging to the field of fireproof coatings, and characterized in that the fireproof coating mainly comprises the following raw materials in parts by weight: 5-6 parts of solid sodium silicate by dry weight, 25-44 parts of liquid sodium silicate by dry weight, 20-40 parts of aluminum hydroxide, 3-10 parts of low-melting-point glass powder, 5-20 parts of magnesium oxide, 0-10 parts of redispersible latex powder, 0.1-5 parts of a waterproof agent, 0.1-1 part of an antifoaming agent and 0-20 parts of water. Compared with the prior art, the invention has the advantages of high strength of the expansion layer, small smoke amount, excellent film forming and fire resistance, low cost, simple preparation process, convenient operation and the like.

Description

A new type of inorganic intumescent steel structure fireproof coating and preparation method thereof

technical field

The invention relates to a fireproof coating, in particular to a novel inorganic expansion steel structure fireproof coating and a preparation method thereof, belonging to the field of fireproof coatings.

Background technique

Steel structures are widely used in the field of construction due to their high strength, good toughness, good seismic resistance, and good elongation. The steel structure is a good conductor of heat, and the relationship between its bearing capacity and temperature shows that the bearing capacity will decrease rapidly with the increase of temperature, resulting in its poor fire resistance. Experiments have shown that when the temperature of the steel structure reaches about 550 ℃, the steel structure will lose most of its bearing capacity. When a fire occurs, the temperature of the fire site can reach about 1000 ℃. At this temperature, the building collapses due to the loss of bearing capacity and deformation of the steel structure, resulting in a large number of casualties and property losses. In this regard, people usually use fire protection methods such as concrete cladding, thermal insulation clapboard cladding, mineral fiber and cement mixing and spraying, and steel structure fireproof coating spraying to protect steel structures from fire and flame. Among them, the application of fire retardant coatings is the most direct, convenient and effective method, and also has excellent decorative properties, so it has been widely used.

Fire retardant coatings for steel structures can be divided into intumescent and non-intumescent fire retardant coatings according to different flame retardant mechanisms; indoor and outdoor fire retardant coatings can be divided according to the scope of use; Solvent-based fire retardant coatings; according to the thickness of the coating, it can be divided into thick (>7mm), thin (3-7mm) and ultra-thin (<3mm) fireproof coatings.

Thick-coated steel structure fireproof coatings are mostly inorganic fireproof coatings. Such coatings are cheap, emit less harmful gases during flame retardant, and are environmentally friendly. However, they have large thickness, inconvenient construction, insufficient adhesion, and poor decoration, etc. Disadvantages: The thin intumescent steel structure fireproof coating is mainly water-soluble. The thickness of the coating during construction is generally between 3 and 7mm, and the decoration and physical and chemical properties are good. source to protect building steel components. This kind of fire retardant coating is mostly made of organic polymer base material as a binder, which will be accompanied by the generation of a large amount of harmful gases during flame retardant, which is not friendly to the environment; ultra-thin steel structure fire retardant coatings have excellent bonding properties and excellent leveling properties. Good finish. The ultra-thin coating is less than 3mm, the construction is convenient, and the coating dries quickly. However, at present, most of the ultra-thin steel structure fireproof coatings are mainly organic types, which pollute the environment during production and construction, release a large amount of toxic fumes during flame retardant, and endanger human health; in addition, they have high price, weather resistance and aging resistance. Inadequate and other deficiencies, do not meet the future development trend of green materials.

Chinese patent CN 105885488A discloses a preparation method of a novel inorganic ultra-thin expanded steel structure fireproof coating. Liquid sodium silicate, expanded graphite, low-melting glass powder, magnesium hydroxide, latex powder and water are weighed according to the formula, mixed After it is uniform, add it to the mixer to stir to make the coating evenly dispersed, and then put it in a can for later use. In this patent, liquid sodium silicate is used alone as a binder. It has been proved by experiments that when liquid sodium silicate is used alone, the liquid silicic acid has a lower modulus. The curing time of sodium is too long and the water resistance is too poor. With the increase of the modulus, the curing time of the liquid sodium silicate becomes shorter and the water resistance is enhanced, but the expansion is poor, and there are wrinkles and burning after the coating film is formed. Over time, cracking is easy to occur, and the fireproof performance cannot meet the requirements; in addition, the large use of magnesium hydroxide in this patent will cause the coating to crack, and the coating has poor expansion, reducing the fireproof performance.

Therefore, in view of the above technical problems, the present application proposes a new type of inorganic intumescent steel structure fireproof coating and a preparation method thereof. The preparation process is simple, the operation is convenient, the green environmental protection and the like are featured.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a new type of inorganic intumescent steel structure fireproof coating with high strength of intumescent layer, small amount of smoke, excellent film-forming and fireproof performance, low cost, simple preparation process, convenient operation, green environmental protection and preparation method thereof .

To achieve the above object, the present invention provides the following technical solutions:

A new type of inorganic intumescent steel structure fireproof coating mainly comprises the following raw materials in parts by weight: 5-6 parts by dry weight of solid sodium silicate, 25-44 parts by dry weight of liquid sodium silicate, 20-40 parts of aluminum hydroxide, low melting point 3-10 parts of glass powder, 5-20 parts of magnesium oxide, 0-10 parts of redispersible latex powder, 0.1-5 parts of waterproofing agent, 0.1-1 part of defoamer, 0-20 parts of water,

and prepared by:

a. Weigh out 5-6 parts by weight of solid sodium silicate, 20-40 parts by weight of aluminum hydroxide, 3-10 parts by weight of low-melting glass powder, 5-20 parts by weight of magnesium oxide, and 0-10 parts by weight of redispersible latex powder. 0.1-5 parts by weight of water repellent and 0.1-5 parts by weight of water repellent, mixed evenly, pulverized and ground, and all passed through a 380-420 mesh sieve to obtain component A;

b. Weigh 25-44 parts by weight of liquid sodium silicate and 0.1-1 part by weight of defoaming agent respectively, add 0-20 parts by weight of water, mix and disperse evenly to obtain component B;

c. Mix the A component and the B component prepared in the above steps and disperse them uniformly to obtain a new type of inorganic intumescent steel structure fireproof coating.

The above dry weight is the weight after removing the water, and it can also be said to be the net weight.

Preferably, the raw materials include the following parts by weight: 5.3-5.6 parts by weight of solid sodium silicate, 30-40 parts by weight of liquid sodium silicate, 25-35 parts by weight of aluminum hydroxide, and 6-9 parts by weight of low-melting glass powder , 6-9 parts by weight of magnesium oxide, 2-6 parts by weight of redispersible latex powder, 0.5-3 parts by weight of waterproofing agent, 0.15-0.25 parts by weight of defoaming agent, and 0-10 parts by weight of water.

Further, the modulus of the above-mentioned solid sodium silicate is not higher than 2.0, the modulus of the solid sodium silicate is not lower than 2.5, and the Baume degree is 40.

Preferably, the modulus of the solid sodium silicate is 0.5 to 1.5, and the modulus of the solid sodium silicate is 2.5 to 3.5.

Further, the melting range of the low-melting glass powder is: 250-550°C, preferably: Bi ₂ O ₃ -B ₂ O ₃ -ZnO, the melting range is 325-460° C; P ₂ O ₅ -B ₂ O ₃ ～ZnO, the melting range is 260～430℃ _{; P2O5} ～B2O3～MgO, the melting range is 325～450℃ _{; PbO} ～ _B2O3 ～ _SiO2 , the melting range is ₃₂₅ ～450℃.

Further, the above-mentioned waterproofing agent is a silicone waterproofing agent.

Further, the above-mentioned defoamer is tributyl phosphate.

A preparation method of a novel inorganic expansion steel structure fireproof coating, the steps are as follows:

a. Weigh out 5-6 parts by weight of solid sodium silicate, 20-40 parts by weight of aluminum hydroxide, 3-10 parts by weight of low-melting glass powder, 5-20 parts by weight of magnesium oxide, and 0-10 parts by weight of redispersible latex powder. 0.1 to 5 parts by weight of water repellent and 0.1 to 5 parts by weight of water repellent, mixed evenly, pulverized and ground, and all passed through a 380-420 mesh sieve, and the obtained powder is component A;

b. Weigh 25 to 44 parts by weight of liquid sodium silicate and 0.1 to 1 part by weight of defoamer, add 0 to 20 parts by weight of water, mix and disperse evenly, and are component B;

c. Mix and disperse the A component and the B component obtained in the above steps evenly, and seal and store to obtain a new type of inorganic intumescent steel structure fireproof coating.

Further, a pulverizer or a ball mill is used for pulverization.

As a preferred solution, the above-mentioned raw materials are individually packaged, and in actual use, a new type of inorganic intumescent steel structure fireproof coating can be obtained by preparing according to the above-mentioned steps.

The pretreatment method of the steel plate substrate applicable to the present invention is the same as that of the organic fireproof paint, and the fireproof paint can be coated on the surface of the treated steel plate substrate by brushing, scraping, spraying and the like.

Compared with the prior art, the present invention has the following beneficial effects:

1. The raw materials are non-toxic and harmless, the ratio is scientific, the preparation process is simple, and in the process of use, there will be no odor released, the coating is weakly alkaline, almost harmless to the skin, non-stick to the skin, and can be washed off with water.

2. Use the mixed components of solid and liquid sodium silicate to make film agent and foaming agent, use low modulus solid sodium silicate and high modulus liquid sodium silicate to compound, the coating curing time is suitable, and the film forming property is good , and has excellent high temperature expansion and high temperature foam insulation and fireproof performance.

3. The foaming temperature of aluminum hydroxide is about 200 ℃, which is consistent with the heating expansion temperature of sodium silicate, which is conducive to expansion, and magnesium oxide, as a high temperature resistant filler, plays an important role in the formation of the expansion layer and the fire resistance.

4. On the basis of ensuring excellent low-temperature film-forming and bonding properties, it has the same weather resistance and aging resistance as buildings.

5. Significantly reduce the release of toxic fumes, and the amount of fumes is less than 10% of that of organic fire retardant coatings.

Description of drawings

Fig. 1 is the fire resistance curve of liquid sodium silicate formula;

Figure 2 is the appearance of different modulus liquid sodium silicate formulations before and after fire prevention;

Fig. 3 is the appearance of film formation of solid sodium silicate formulations with different modulus;

Fig. 4 is the appearance diagram of solid-liquid sodium silicate mixing ratio formula before and after fire prevention;

Fig. 5 is the fire resistance curve of solid-liquid sodium silicate weight ratio;

Fig. 6 is the influence of the dosage of solid-liquid sodium silicate film-forming agent on the appearance of the coating;

Figure 7 shows the effect of the content of solid-liquid sodium silicate film-forming agent on the fire resistance of coatings;

Figure 8 is the flame retardant curve of different blowing agents;

Fig. 9 is the appearance diagram after fire prevention of different blowing agents;

Figure 10 shows the effect of Al(OH) ₃ content on the fire resistance of coatings;

Figure 11 shows the appearance of flame retardant samples with different Al(OH) ₃ contents.

Detailed ways

Preferred embodiments of the present invention will be described in detail below.

Example 1: In this example, the effects of liquid sodium silicate alone on the film-forming properties and fire-retardant properties of fire-retardant coatings were studied. , and the film-forming properties of the samples are shown in Table 1.

Table 1 Influence of liquid sodium silicate modulus on coating film-forming properties

It can be seen from Table 1 that when the low modulus liquid sodium silicate is used as a film-forming agent, the curing time is longer. When the modulus is 1.5, the curing time is greater than 96h, and the curing time decreases with the increase of the liquid sodium silicate modulus. , when the modulus is above 3.0, the curing time is only 2h, but because the high modulus sample dries too fast, wrinkles will appear, which is not conducive to film formation, and it is easy to crack during the burning process. For the purpose of fire prevention, it can also be concluded that the lower the modulus, the better the expansion of the sample.

Fire resistance tests were carried out on liquid sodium silicate samples with modulus 2.0, 2.5, 3.0, and 3.3, and the test results are shown in Figure 1.

According to the fire resistance curve in Figure 1, the curves a, b, c, and d in the figure correspond to moduli of 2.0, 2.5, 3.0, and 3.3, respectively. Within 20 minutes of the test time, the heating rate of the steel plate increases first with the increase of the modulus of the liquid sodium silicate. When the modulus of liquid sodium silicate is small, the water content in the system is high, which not only absorbs heat during the heating process, but also generates void content in the coating, reduces the thermal conductivity of the coating, and slows down the temperature rise of the steel plate. speed. However, in the later stage of the test, the final temperature of the liquid sodium silicate samples with different modulus was stable at around 350 °C. transfer to achieve a good fire protection effect.

Figure 2 is the appearance diagrams of liquid sodium silicate formulations with different modulus before and after fire protection. In the figure, e, f, g, and h correspond to the appearance diagrams of a, b, c, and d after fire protection, respectively.

It can be seen from Fig. 2 that the liquid sodium silicate samples with different modulus all swelled, but the samples with low modulus had a more serious burn-through phenomenon, which was due to the large swelling height of the low modulus samples, the thin wall of the swelling layer, and the partial strength. Low, under the violent impact of the flame, melt-through occurs, and with the increase of the modulus, the strength of the expansion layer also increases, but the expansion decreases. In summary, the liquid sodium silicate with a modulus of 3.0 The performance of the sample as a separate film former is better, but its film formation and fire resistance still have problems. For example, there are wrinkles on the surface of the sample, the expansion ratio is low, and the fire resistance needs to be improved.

Example 2: This example shows the influence of the modulus of solid sodium silicate alone on the film-forming property of the coating: in order to prepare a pure solid-phase coating, the The film-forming properties of sodium were studied, and the film-forming properties and appearance of the samples are shown in Table 2 and Figure 3.

Table 2 Influence of the modulus of solid sodium silicate on the film-forming properties of coatings

modulus 1.0 2.0 2.5 3.3 Water consumption (solid-liquid ratio) 1.7:1 1.7:1 1.7:1 1.7:1 Number of cracks/(bar/cm²) - 0.6 0.8 0.8 Crack length/cm - 0.7 1 1 Crack width/cm - 0.1 0.1 0.2 solidification >24h about 2h about 2h about 2h

It can be seen from Table 2 and Figure 3 that a, b, c, and d in Figure 3 correspond to moduli 1.0, 2.0, 2.5, and 3.3, respectively. Except for solid sodium silicate with a modulus of 1.0, solid sodium silicate with other moduli When making a film-forming agent, serious cracking phenomenon occurs, and the larger the modulus is, the more obvious the cracking phenomenon is, and the phenomenon of falling off occurs. This is because the solubility of solid sodium silicate in water increases with the continuous increase of the modulus of sodium silicate. When the modulus is 3.3, it is only soluble in hot water. For inorganic fireproof coatings, the main bonding material is sodium silicate solution, so the high modulus solid sodium silicate has poor adhesion, resulting in sample cracking. serious. The solid sodium silicate sample with a modulus of 1.0 has good adhesion, but its hardening time is long, and the sample does not harden for 12 hours, so the solid sodium silicate is not suitable for forming a film alone as a film-forming agent for inorganic fireproof coatings.

Embodiment 3: The present embodiment is the influence of the solid-liquid sodium silicate mixing ratio on the film-forming performance and fire resistance of the fire-retardant coating, and the sodium silicate is the most ideal inorganic film-forming agent, but it can be known from Example 1 and Example 2, Whether it is liquid sodium silicate or solid sodium silicate alone as a film-forming agent, there are some deficiencies. In the process of water, the volume shrinkage of the sample will lead to cracking), so in this embodiment, according to the analysis of the above experimental results, the liquid sodium silicate with a modulus of 3.0 is selected as the main, and a small amount of solid sodium silicate with a modulus of 1.0 is used as the auxiliary. The solid-liquid mixed sodium silicate is used as a film-forming agent for fireproof coatings for steel structures. The properties and fire resistance were studied, as shown in Table 3 and Figure 4.

Table 3 Influence of sodium silicate mixed as film-forming agent on the film-forming properties of coatings

Mass ratio (solid:liquid) 0:40 1:39 1:12 1:7 1:5 Film formation slightly wrinkled Severely wrinkled slightly wrinkled smooth and flat smooth and flat solidification 1h 1.5h 2h 2h 6h expansion factor 9 9 10 11 13

It can be seen from Table 3 and Figure 4 that a, b, c, d, and e in Figure 4 correspond to solid-liquid mass ratios of 0:40, 1:39, 1:12, 1:7, and 1:5, respectively, and f in the figure , g, h, i, and j correspond to the appearance of a, b, c, d, and e after fire protection, respectively. When no solid sodium silicate is added, the surface of the sample is wrinkled, and with the increase of the solid-liquid sodium silicate mass ratio , that is, as the amount of solid sodium silicate added increases, the surface of the sample is gradually smooth, and the expansion ratio also increases. When the mass ratio of solid-liquid sodium silicate is 1:7, the surface of the sample is smooth and flat, without wrinkles, and the film-forming property The best, and the intumescent layer is a multi-layer structure with excellent fire resistance. This is mainly because the addition of solid sodium silicate not only achieves the compounding between solid and liquid sodium silicate, but also fully combines the advantages of film-forming and swellability of sodium silicate with different modulus, so that the sample slurry is more suitable for smearing, and the curing time is suitable. It can form an expansion layer with excellent structure. When the mass ratio of solid-liquid sodium silicate is higher than 1:7, although the film formation is good, due to the gradual increase in the content of low-modulus sodium silicate, the intumescent layer suffers serious burn-through, and the curing time of the coating is prolonged. , is not conducive to film formation and fire prevention.

It can be obtained from the fire resistance curves of different solid-liquid sodium silicate weight ratios in Figure 5. As the amount of solid sodium silicate added increases, the fire resistance of the sample is greatly improved. When no solid sodium silicate is added, the test temperature of the sample is slowly raised to 60 min 350℃, when the mass ratio of low modulus and high modulus solid-liquid sodium silicate is 1:7, the test temperature of the sample is raised to 300℃ in 60min. Compared with the sample without solid sodium silicate, the final temperature is reduced by about 50℃ , showing more excellent fire performance, which is mainly due to the mixing of solid low modulus and liquid high modulus sodium silicate, which not only has the excellent film-forming properties of liquid sodium silicate and the foaming properties of low modulus solid sodium silicate At the same time, the mixture of high and low modulus sodium silicate makes the structure and strength of the intumescent layer optimal, so that the coating has more excellent fire resistance. However, when the amount of solid sodium silicate added is too high, the reduction in the strength of the intumescent layer will lead to burn-through, and then its fire resistance will decrease.

Embodiment 4: This embodiment is the influence of the content of solid-liquid sodium silicate mixed film-forming agent on the performance of fire-retardant coatings

When the mass ratio of solid sodium silicate and liquid sodium silicate is 1:7, the effect of film-forming agent content on the film-forming property and fire-retardant performance of fire-retardant coatings is investigated, as shown in Table 4 and Figure 6.

Table 4 Influence of the content of solid-liquid sodium silicate mixed film-forming agent on the film-forming properties of coatings

Dosage/weight part 20 30 40 50 Film formation Severe cracking slightly rough smooth and flat smooth and flat solidification 1h 1.5h 2h 2h expansion factor - 3 10 13

It can be seen from Table 4 and Figure 6 that the corresponding dosages of a, b, c, and d in Figure 6 are 20, 30, 40, and 50, respectively. When the dosage of the film-forming agent is 20 parts by weight, it is insufficient due to its small dosage. In order to play a bonding effect on the whole coating, the sample has serious cracking phenomenon. With the gradual increase of the film-forming agent dosage, the appearance of the coating tends to be good. The experimental results show that the film-forming agent dosage is more than 30 parts by weight. Can meet the film formation.

Fire performance tests were carried out on samples with a film-forming agent content of 30, 40, and 50 parts by weight, and the test results are shown in Figure 7 .

It can be seen from Figure 7 that after the fire test of the sample for 60 minutes, the final temperature of the steel plate first decreased and then increased with the increase of the film-forming agent content. When the film-forming agent content was 30 parts by weight, the proportion of sodium silicate in the sample was less, and the expansion performance It is worse than the sample with a dosage of 40 parts by weight, so its fire resistance is poor. When the dosage of the film-forming agent is 50 parts by weight, the fire resistance of the sample is the worst. This is because when the dosage of the film-forming agent is 50 parts by weight, it accounts for The total specific gravity of the coating is too high, the strength of the intumescent layer is low, and it is easy to burn through during fire protection, so its fire resistance is significantly reduced. When the film-forming agent dosage is 40 parts by weight, the fire resistance of the sample is the best, and the steel plate after 60min test The final temperature is about 330°C.

Example 5: In this example, the effects of three flame retardants with different foaming temperatures: Al(OH) ₃ around 200°C, Mg(OH) ₂ around 350°C, and MgCO ₃ around 500°C on the fire resistance of the coating were investigated. The results are shown in Figure 8 and Figure 9.

It can be seen from Figure 8 that the sample with Al(OH) ₃ as the foaming agent shows the best fire performance. When the fire is 60 minutes, the temperature of the back of the steel plate is about 280 °C, and the expansion layer structure is a multi-layer expansion structure, so the performance is the best. It can be seen from Figure 9 that a, b, c, and d in Figure ₉ correspond to the sides _of aluminum hydroxide, magnesium hydroxide, magnesium carbonate, and aluminum hydroxide, respectively. The sample used as a foaming agent has large cavities and no internal expansion occurs. Only the sample with Al(OH) ₃ as a foaming agent has a multi-layer expansion structure. This is because the foaming temperature of Al(OH) ₃ is different from the silicon we use. The melting and foaming temperature of sodium is consistent.

Example 6: This example is the influence of the dosage of aluminum hydroxide on the film-forming property and fire resistance of the coating: the dosage (parts by weight) of aluminum hydroxide is 10 parts, 15 parts, 20 parts, 25 parts, and 30 parts, respectively. , 35 parts, 40 parts and 45 parts of fire retardant coatings were studied on film formation and fire resistance. The results are shown in Figure 10 and Figure 11, in which a, b, c, d, e, f, g, The corresponding dosages of h are 10, 15, 20, 25, 30, 35, 40, and 45, respectively.

It can be seen from Figure 10 that with the increase of the content of Al(OH) ₃ , the fire resistance first increases and then weakens. When the content of Al(OH) 3 is about 35%, the performance reaches the best; corresponding to Figure 11, when the content of Al(OH) ₃ is low , there is a serious burn-through phenomenon, and the burn-through phenomenon is improved with the increase of the content. This is because Al(OH) ₃ acts as a flame retardant and is also an excellent inorganic filler, and its reaction product, alumina, is also a high-temperature resistant material. , which can enhance the fire resistance of the coating.

Example 7:

Including the following raw materials by weight: 5 parts by dry weight of solid sodium silicate, 25 parts by dry weight of liquid sodium silicate, that is, the solid-liquid ratio of sodium silicate is 1:5, the modulus of solid sodium silicate is 0.5, and the solid silicic acid The modulus of sodium is 3, 20 parts of aluminum hydroxide, 10 parts of low-melting glass powder, 5 parts of magnesium oxide, 0 parts of Momentive HP8029 dispersible polymer powder, 3 parts of silicone water repellent, 0.6 parts of tributyl phosphate , 10 parts of water;

Prepared by the following steps:

a. Accurately weigh solid sodium silicate, aluminum hydroxide, Bi ₂ O ₃ -B ₂ O ₃ -ZnO, magnesium oxide, redispersible latex powder, and silicone water repellent according to the above-mentioned parts by weight, mix them and place them in a pulverizer or In the ball mill and other equipment, the pulverization and grinding are uniform, and the fineness reaches 380 mesh and sieved, that is, the A component is obtained.

b. Accurately weigh liquid sodium silicate and tributyl phosphate according to the above weight parts, add water, mix and disperse evenly, and obtain B component.

c. Place the components A and B in the agitator in the above steps, mix and disperse evenly, to obtain a new type of inorganic intumescent steel structure fireproof coating.

The performance of the new inorganic intumescent steel structure fireproof coating prepared by the above method is tested, and the process is as follows:

The new inorganic intumescent steel structure fireproof coating prepared above is brushed on the steel plate (10mm×10mm×1.5mm) at one time, the thickness of the coating layer is 2.9mm, the humidity is 60%±5%, and the temperature is about 25 ℃. Conditioning at low temperature, fire resistance test after 14 days of standard curing: place the side coated with fire retardant paint on the flame of an alcohol burner, 10cm away from the flame, measure the temperature on the other side of the steel plate with a surface thermocouple and record the temperature and time data.

The results are shown in the following table:

Test items New Inorganic Intumescent Steel Structure Fire Resistant Coating Initial drying crack resistance No cracks on the surface Dry time/min 180 Fire resistance time/min >100 Coating thickness/mm 3.0 Fire resistance temperature/℃ 308 Adhesion/Grade 1 Pencil hardness/H 5 Flue gas volume/(inorganic: organic) 1:20

Example 8:

Including the following raw materials by weight: 5.4 parts of solid sodium silicate dry weight, 40.5 parts of liquid sodium silicate dry weight, that is, the solid-liquid ratio of sodium silicate is 1:7.5, the modulus of solid sodium silicate is 1.5, and the solid silicic acid The modulus of sodium is 3.3, 24 parts of aluminum hydroxide, 9 parts of low-melting glass powder, 7 parts of magnesium oxide, 10 parts of WACKER 5044N dispersible polymer powder, 0.1 part of silicone water repellent, 1 part of tributyl phosphate, 20 parts of water;

Prepared by the following steps:

a. Accurately weigh solid sodium silicate, aluminum hydroxide, Bi ₂ O ₃ -B ₂ O ₃ -ZnO, magnesium oxide, redispersible latex powder, and silicone water repellent according to the above-mentioned parts by weight, mix them and place them in a pulverizer or In the ball mill and other equipment, the pulverization and grinding are uniform, and the fineness reaches 410 mesh and sieved, that is, the A component is obtained.

b. Accurately weigh liquid sodium silicate and tributyl phosphate according to the above weight parts, add water, mix and disperse evenly, and obtain B component.

c. Place the components A and B in the agitator in the above steps, mix and disperse evenly, to obtain a new type of inorganic intumescent steel structure fireproof coating.

The performance of the new inorganic intumescent steel structure fireproof coating prepared by the above method is tested, and the process is as follows:

The new inorganic intumescent steel structure fireproof coating prepared above is brushed on the steel plate (10mm×10mm×1.5mm) at one time, the thickness of the coating layer is 2.9mm, the humidity is 60%±5%, and the temperature is about 25 ℃. Conditioning at low temperature, fire resistance test after 14 days of standard curing: place the side coated with fire retardant paint on the flame of an alcohol burner, 10cm away from the flame, measure the temperature on the other side of the steel plate with a surface thermocouple and record the temperature and time data.

The results are shown in the following table:

Test items New Inorganic Intumescent Steel Structure Fire Resistant Coating Initial drying crack resistance Smooth surface without cracks Dry time/min 150 Fire resistance time/min >120 Coating thickness/mm 3.0 Fire resistance temperature/℃ 299 Adhesion/Grade 1 Pencil hardness/H 5 Flue gas volume/(inorganic: organic) 1:10

Example 9:

Including the following raw materials by weight: 5.5 parts of solid sodium silicate dry weight, 44 parts of liquid sodium silicate dry weight, that is, the solid-liquid ratio of sodium silicate is 1:8, the modulus of solid sodium silicate is 1, and the solid silicic acid The modulus of sodium is 2.8, 30 parts of aluminum hydroxide, 8 parts of low-melting glass powder, 10 parts of magnesium oxide, 6 parts of WACKER 5044N dispersible polymer powder, 1 part of silicone water repellent, 0.8 parts of tributyl phosphate, 0 parts of water;

Prepared by the following steps:

a. Accurately weigh solid sodium silicate, aluminum hydroxide, Bi ₂ O ₃ -B ₂ O ₃ -ZnO, magnesium oxide, redispersible latex powder, and silicone water repellent according to the above-mentioned parts by weight, mix them and place them in a pulverizer or In the ball mill and other equipment, the pulverization and grinding are uniform, and the fineness reaches 400 mesh and sieved, that is, the A component is obtained.

b. Accurately weigh liquid sodium silicate and tributyl phosphate according to the above weight parts, add water, mix and disperse evenly, and obtain B component.

c. Place the components A and B in the agitator in the above steps, mix and disperse evenly, to obtain a new type of inorganic intumescent steel structure fireproof coating.

The performance of the new inorganic intumescent steel structure fireproof coating prepared by the above method is tested, and the process is as follows:

The new inorganic intumescent steel structure fireproof coating prepared above is brushed on the steel plate (10mm×10mm×1.5mm) at one time, the thickness of the coating layer is 2.9mm, the humidity is 60%±5%, and the temperature is about 25 ℃. Conditioning at low temperature, fire resistance test after 14 days of standard curing: place the side coated with fire retardant paint on the flame of an alcohol burner, 10cm away from the flame, measure the temperature on the other side of the steel plate with a surface thermocouple and record the temperature and time data.

The results are shown in the following table:

Test items New Inorganic Intumescent Steel Structure Fire Resistant Coating Initial drying crack resistance Smooth surface without cracks Dry time/min 120 Fire resistance time/min >120 Coating thickness/mm 2.9 Fire resistance temperature/℃ 292 Adhesion/Grade 1 Pencil hardness/H 5 Flue gas volume/(inorganic: organic) 1:12

Example 10:

Including the following raw materials by weight: 6 parts of solid sodium silicate dry weight, 39 parts of liquid sodium silicate dry weight, that is, the solid-liquid ratio of sodium silicate is 1:6.5, the modulus of solid sodium silicate is 1, and the solid silicic acid The modulus of sodium is 3, 40 parts of aluminum hydroxide, 6 parts of low-melting glass powder, 15 parts of magnesium oxide, 8 parts of Wanwei WWJF8020 redispersible latex powder, 2 parts of silicone waterproofing agent, 0.6 parts of tributyl phosphate, 3 parts water;

Prepared by the following steps:

a. Accurately weigh solid sodium silicate, aluminum hydroxide, Bi ₂ O ₃ -B ₂ O ₃ -ZnO, magnesium oxide, redispersible latex powder, and silicone water repellent according to the above-mentioned parts by weight, mix them and place them in a pulverizer or In the ball mill and other equipment, the pulverization and grinding are uniform, and the fineness reaches 390 mesh and sieved, and then the A component is obtained.

b. Accurately weigh liquid sodium silicate and tributyl phosphate according to the above weight parts, add water, mix and disperse evenly, and obtain B component.

c. Place the components A and B in the agitator in the above steps, mix and disperse evenly, to obtain a new type of inorganic intumescent steel structure fireproof coating.

The performance of the new inorganic intumescent steel structure fireproof coating prepared by the above method is tested, and the process is as follows:

The new inorganic intumescent steel structure fireproof coating prepared above is brushed on the steel plate (10mm×10mm×1.5mm) at one time, the thickness of the coating layer is 2.9mm, the humidity is 60%±5%, and the temperature is about 25 ℃. Conditioning at low temperature, fire resistance test after 14 days of standard curing: place the side coated with fire retardant paint on the flame of an alcohol burner, 10cm away from the flame, measure the temperature on the other side of the steel plate with a surface thermocouple and record the temperature and time data.

The results are shown in the following table:

Test items New Inorganic Intumescent Steel Structure Fire Resistant Coating Initial drying crack resistance Smooth surface without cracks Dry time/min 180 Fire resistance time/min >120 Coating thickness/mm 2.9 Fire resistance temperature/℃ 310 Adhesion/Grade 1 Pencil hardness/H 5 Flue gas volume/(inorganic: organic) 1:11

Example 11:

Including the following raw materials by weight: 5.7 parts of solid sodium silicate dry weight, 34 parts of liquid sodium silicate dry weight, that is, the solid-liquid ratio of sodium silicate is 1:5.9, the modulus of solid sodium silicate is 0.8, and the solid silicic acid The modulus of sodium is 2.5, 27 parts of aluminum hydroxide, 3 parts of low-melting glass powder, 12 parts of magnesium oxide, 2 parts of Wanwei WWJF8020 redispersible latex powder, 4 parts of silicone water repellent, 0.4 parts of tributyl phosphate, 6 parts of water;

Prepared by the following steps:

a. Accurately weigh solid sodium silicate, aluminum hydroxide, Bi ₂ O ₃ -B ₂ O ₃ -ZnO, magnesium oxide, redispersible latex powder, and silicone water repellent according to the above-mentioned parts by weight, mix them and place them in a pulverizer or In the ball mill and other equipment, pulverize and grind evenly, and sieve the fineness up to 420 mesh to obtain the A component.

b. Accurately weigh liquid sodium silicate and tributyl phosphate according to the above weight parts, add water, mix and disperse evenly, and obtain B component.

c. Place the components A and B in the agitator in the above steps, mix and disperse evenly, to obtain a new type of inorganic intumescent steel structure fireproof coating.

The performance of the new inorganic intumescent steel structure fireproof coating prepared by the above method is tested, and the process is as follows:

The new inorganic intumescent steel structure fireproof coating prepared above is brushed on the steel plate (10mm×10mm×1.5mm) at one time, the thickness of the coating layer is 2.9mm, the humidity is 60%±5%, and the temperature is about 25 ℃. Conditioning at low temperature, fire resistance test after 14 days of standard curing: place the side coated with fire retardant paint on the flame of an alcohol burner, 10cm away from the flame, measure the temperature on the other side of the steel plate with a surface thermocouple and record the temperature and time data.

The results are shown in the following table:

Test items New Inorganic Intumescent Steel Structure Fire Resistant Coating Initial drying crack resistance Smooth surface without cracks Dry time/min 120 Fire resistance time/min >150 Coating thickness/mm 2.9 Fire resistance temperature/℃ 280 Adhesion/Grade 1 Pencil hardness/H 5 Flue gas volume/(inorganic: organic) 1:15

Example 12:

Including the following raw materials by weight: 5.8 parts of solid sodium silicate dry weight, 40.6 parts of liquid sodium silicate dry weight, that is, the solid-liquid ratio of sodium silicate is 1:7, the modulus of solid sodium silicate is 1.2, and the solid silicate is 1.2. The modulus of sodium is 3.5, 33 parts of aluminum hydroxide, 7 parts of low-melting glass powder, 20 parts of magnesium oxide, 5 parts of Momentive HP8029 dispersible polymer powder, 5 parts of silicone water repellent, 0.2 parts of tributyl phosphate , 17 parts of water;

Prepared by the following steps:

a. Accurately weigh solid sodium silicate, aluminum hydroxide, Bi ₂ O ₃ -B ₂ O ₃ -ZnO, magnesium oxide, redispersible latex powder, and silicone water repellent according to the above-mentioned parts by weight, mix them and place them in a pulverizer or In the ball mill and other equipment, the pulverization and grinding are uniform, and the fineness reaches 400 mesh and sieved, that is, the A component is obtained.

b. Accurately weigh liquid sodium silicate and tributyl phosphate according to the above weight parts, add water, mix and disperse evenly, and obtain B component.

c. Place the components A and B in the agitator in the above steps, mix and disperse evenly, to obtain a new type of inorganic intumescent steel structure fireproof coating.

The performance of the new inorganic intumescent steel structure fireproof coating prepared by the above method is tested, and the process is as follows:

The new inorganic intumescent steel structure fireproof coating prepared above is brushed on the steel plate (10mm×10mm×1.5mm) at one time, the thickness of the coating layer is 2.9mm, the humidity is 60%±5%, and the temperature is about 25 ℃. Conditioning at low temperature, fire resistance test after 14 days of standard curing: place the side coated with fire retardant paint on the flame of an alcohol burner, 10cm away from the flame, measure the temperature on the other side of the steel plate with a surface thermocouple and record the temperature and time data.

The results are shown in the following table:

Test items New Inorganic Intumescent Steel Structure Fire Resistant Coating Initial drying crack resistance Smooth surface without cracks Dry time/min 120 Fire resistance time/min >140 Coating thickness/mm 2.9 Fire resistance temperature/℃ 288 Adhesion/Grade 1 Pencil hardness/H 5 Flue gas volume/(inorganic: organic) 1:13

Example 13:

Including the following raw materials by weight: 5.2 parts of solid sodium silicate dry weight, 36 parts of liquid sodium silicate dry weight, that is, the solid-liquid ratio of sodium silicate is 1:6.9, the modulus of solid sodium silicate is 1, and the solid silicic acid The modulus of sodium is 3, aluminum hydroxide 37 parts, low melting point glass powder 4 parts, magnesium oxide 18 parts, WACKER 5044N dispersible polymer powder 4 parts, silicone water repellent 0.1 parts, tributyl phosphate 0.1 parts, 13 parts of water;

Prepared by the following steps:

a. Accurately weigh solid sodium silicate, aluminum hydroxide, Bi ₂ O ₃ -B ₂ O ₃ -ZnO, magnesium oxide, redispersible latex powder, and silicone water repellent according to the above-mentioned parts by weight, mix them and place them in a pulverizer or In the ball mill and other equipment, the pulverization and grinding are uniform, and the fineness reaches 410 mesh and sieved, that is, the A component is obtained.

b. Accurately weigh liquid sodium silicate and tributyl phosphate according to the above weight parts, add water, mix and disperse evenly, and obtain B component.

c. Place the components A and B in the agitator in the above steps, mix and disperse evenly, to obtain a new type of inorganic intumescent steel structure fireproof coating.

The performance of the new inorganic intumescent steel structure fireproof coating prepared by the above method is tested, and the process is as follows:

The new inorganic intumescent steel structure fireproof coating prepared above is brushed on the steel plate (10mm×10mm×1.5mm) at one time, the thickness of the coating layer is 2.9mm, the humidity is 60%±5%, and the temperature is about 25 ℃. Conditioning at low temperature, fire resistance test after 14 days of standard curing: place the side coated with fire retardant paint on the flame of an alcohol burner, 10cm away from the flame, measure the temperature on the other side of the steel plate with a surface thermocouple and record the temperature and time data.

The results are shown in the following table:

Test items New Inorganic Intumescent Steel Structure Fire Resistant Coating Initial drying crack resistance Smooth surface without cracks Dry time/min 120 Fire resistance time/min >120 Coating thickness/mm 2.8 Fire resistance temperature/℃ 293 Adhesion/Grade 1 Pencil hardness/H 5 Flue gas volume/(inorganic: organic) 1:14

The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, on the premise of not departing from the inventive concept of the present invention, several changes and improvements can be made, which belong to the present invention. the scope of protection of the invention.

Claims (7)

1. A new type of inorganic intumescent steel structure fireproof coating is composed of the following raw materials in parts by weight: 5-6 parts by weight of solid sodium silicate, 25-44 parts by dry weight of liquid sodium silicate, 20-40 parts by weight of aluminum hydroxide, 3-10 parts of low-melting glass powder, 5-20 parts of magnesium oxide, 0-10 parts of redispersible latex powder, 0.1-5 parts of waterproofing agent, 0.1-1 part of defoamer, 0-20 parts of water, the solid The modulus of sodium silicate is not higher than 2.0, the modulus of liquid sodium silicate is not lower than 2.5, and the Baume degree is 40; and it is prepared by the following methods: a. Weigh out 5-6 parts by weight of solid sodium silicate, 20-40 parts by weight of aluminum hydroxide, 3-10 parts by weight of low-melting glass powder, 5-20 parts by weight of magnesium oxide, and 0-10 parts by weight of redispersible latex powder. 0.1-5 parts by weight of water repellent and 0.1-5 parts by weight of water repellent, mixed evenly, pulverized and ground, and all passed through a 380-420 mesh sieve to obtain component A; b. Weigh 25-44 parts by weight of liquid sodium silicate and 0.1-1 part by weight of defoaming agent respectively, add 0-20 parts by weight of water, mix and disperse evenly to obtain component B; c. Mix and disperse the A component and the B component prepared in the above steps evenly. 2. The novel inorganic intumescent steel structure fireproof coating according to claim 1 is characterized in that, it is composed of the following raw materials by weight: 5.4-5.8 parts by dry weight of solid sodium silicate, 30-40 parts by dry weight of liquid sodium silicate , 25-35 parts by weight of alumina, 6-9 parts by weight of low-melting glass powder, 6-9 parts by weight of magnesium oxide, 2-6 parts by weight of redispersible latex powder, 0.5-3 parts by weight of waterproofing agent, 0.15 parts by weight of defoamer ~0.25 parts by weight, 0-10 parts by weight of water. 3 . The novel inorganic intumescent fireproof coating for steel structures according to claim 1 or 2 , wherein the melting range of the low-melting glass powder is 250-550° C. 4 . 4. The novel inorganic intumescent steel structure fireproof coating according to claim 1 or 2, wherein the low-melting glass powder is Bi ₂ O ₃ -B ₂ O ₃ -ZnO, P ₂ O ₅ -B ₂ O Any of ₃ -ZnO, _{P2O5 -} B2O3 _- MgO or _{PbO -} B2O3 _{- SiO2} . 5. The novel inorganic intumescent steel structure fireproof coating according to claim 1 or 2, wherein the waterproofing agent is an organosilicon waterproofing agent. 6. The novel inorganic intumescent fireproof coating for steel structure according to claim 1 or 2, wherein the defoamer is tributyl phosphate. 7. a preparation method of novel inorganic expansion steel structure fireproof coating as claimed in claim 1, is characterized in that, is prepared by following steps, and steps are as follows: a. Weigh out 5-6 parts by weight of solid sodium silicate, 20-40 parts by weight of aluminum hydroxide, 3-10 parts by weight of low-melting glass powder, 5-20 parts by weight of magnesium oxide, and 0-10 parts by weight of redispersible latex powder. 0.1 to 5 parts by weight of water repellent and 0.1 to 5 parts by weight of water repellent, mixed evenly, pulverized and ground, and all passed through a 380-420 mesh sieve, and the obtained powder is component A; b. Weigh 25 to 44 parts by weight of liquid sodium silicate and 0.1 to 1 part by weight of defoamer, add 0 to 20 parts by weight of water, mix and disperse evenly, and are component B; c. Mix and disperse the A component and the B component obtained in the above steps evenly, and seal and store to obtain a new type of inorganic intumescent steel structure fireproof coating.

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